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Question
Syringes are used to take blood for blood samples. The pressure of the blood forces the liquid to move into the syringe when the plunger is withdrawn.
Syringes are used to take blood for blood samples. The pressure of the blood forces the liquid to move into the syringe when the plunger is withdrawn.
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Solution
The correct option is A True
The syringe works due to application of atmospheric pressure. It has the same working principle as that of a siphon (shown below). In a siphon, the pressure inside the bottle decreases when the bottle is pressed and released. Thus causes the flow of the liquid from a high-pressure region to this low-pressure region.
The pressure inside the syringe is low and the body is at atmospheric pressure. Therefore, there is a pressure difference. As the plunger is withdrawn, the high pressure blood inside the body pushes to this low-pressure syringe. So, the given statement is true.
True
The syringe works due to application of atmospheric pressure. It has the same working principle as that of a siphon (shown below). In a siphon, the pressure inside the bottle decreases when the bottle is pressed and released. Thus causes the flow of the liquid from a high-pressure region to this low-pressure region.
The pressure inside the syringe is low and the body is at atmospheric pressure. Therefore, there is a pressure difference. As the plunger is withdrawn, the high pressure blood inside the body pushes to this low-pressure syringe. So, the given statement is true.
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